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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP
#define BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/geometry/core/ring_type.hpp>
#include <boost/geometry/core/tag.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/util/add_const_if_c.hpp>
namespace boost { namespace geometry
{
namespace traits
{
/*!
\brief Traits class defining access to exterior_ring of a polygon
\details Should define const and non const access
\ingroup traits
\tparam Polygon the polygon type
\par Geometries:
- polygon
\par Specializations should provide:
- static inline RING& get(POLY& )
- static inline RING const& get(POLY const& )
*/
template <typename Polygon>
struct exterior_ring
{
BOOST_MPL_ASSERT_MSG
(
false, NOT_IMPLEMENTED_FOR_THIS_POLYGON_TYPE
, (types<Polygon>)
);
};
} // namespace traits
#ifndef DOXYGEN_NO_DISPATCH
namespace core_dispatch
{
template <typename Tag, typename Geometry>
struct exterior_ring
{
BOOST_MPL_ASSERT_MSG
(
false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE
, (types<Geometry>)
);
};
template <typename Polygon>
struct exterior_ring<polygon_tag, Polygon>
{
static
typename geometry::ring_return_type<Polygon>::type
apply(typename add_const_if_c
<
boost::is_const<Polygon>::type::value,
Polygon
>::type& polygon)
{
return traits::exterior_ring
<
typename boost::remove_const<Polygon>::type
>::get(polygon);
}
};
} // namespace core_dispatch
#endif // DOXYGEN_NO_DISPATCH
/*!
\brief Function to get the exterior_ring ring of a polygon
\ingroup exterior_ring
\note OGC compliance: instead of ExteriorRing
\tparam P polygon type
\param polygon the polygon to get the exterior ring from
\return a reference to the exterior ring
*/
template <typename Polygon>
inline typename ring_return_type<Polygon>::type exterior_ring(Polygon& polygon)
{
return core_dispatch::exterior_ring
<
typename tag<Polygon>::type,
Polygon
>::apply(polygon);
}
/*!
\brief Function to get the exterior ring of a polygon (const version)
\ingroup exterior_ring
\note OGC compliance: instead of ExteriorRing
\tparam Polygon polygon type
\param polygon the polygon to get the exterior ring from
\return a const reference to the exterior ring
\qbk{distinguish,const version}
*/
template <typename Polygon>
inline typename ring_return_type<Polygon const>::type exterior_ring(
Polygon const& polygon)
{
return core_dispatch::exterior_ring
<
typename tag<Polygon>::type,
Polygon const
>::apply(polygon);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP
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